I want to attach this to a cog/something to turn it into a pulley (see my other post from months ago about a chicken door). Thing is there's loads of cheap cog kits on amazon, but they are all for circular shafts, not a flat ended one like this.

Is there an online shop where I can get bits for the physical attachment of things like this?

If your pulley or gear or... has a - at least one - screw to fasten on the axle and has the same diameter, you are just fine. Mount it with the screw perpendicular to the flat surface on the axle.

If the pulley or gear or... is just pressed over the axle, use some two-component raisin glue and glue it onto the axle - hot glue may not good enough. Better is when you file a notch in the center bore of it, place that notch over the flattened area of the axle and wedge / slide / press a nail or thick solid wire - called key - in and add some hod glue that oozes out on both ends to prevent slipping out of the key.

Since this all very low speed, it does not matter when it is not 100% centered...

The more I think about it, what about the local hardware store. Surely they might have keys or raw stock for pulley systems, garage door, garden tractor. Or, automotive, fan wheels, defroster etc. Bicycle shop. Blacksmith, forge, welder for welding rod, a machinist. Someone that repairs lawn mowers.

If low revs as @allObjects suggests, what about making your own key out of an aluminum can, by making several folds out of a strip? Although aluminum, it should work without slipping. Grind down a screw or nail.

Unfortunately there isnt' a local hardware store (I am fairly rural), and the electronics shop in the nearest city shut down a few years ago. Will take a look at mcmaster.com, or take a stab on some amazon cog sets :)

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